Fast Track Communication

doi:10.1088/0953-4075/41/9/091001

FAST TRACK COMMUNICATION

Fragmentation pathways for selected electronic states of the acetylene dication

T Osipov et al 2008 J. Phys. B: At. Mol. Opt. Phys. 41 091001 (5pp) doi: 10.1088/0953-4075/41/9/091001

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T Osipov¹, T N Rescigno¹, T Weber¹, S Miyabe², T Jahnke³, A S Alnaser^4,5, M P Hertlein¹, O Jagutzki³, L Ph H Schmidt³, M Schöffler³, L Foucar³, S Schössler³, T Havermeier³, M Odenweller³, S Voss³, B Feinberg¹, A L Landers⁶, M H Prior¹, R Dörner³, C L Cocke⁴ and A Belkacem¹
¹ Lawrence Berkeley National Laboratory, Chemical Sciences, Berkeley, CA 94720, USA
² Department of Chemistry, University of California, Davis, CA 9566, USA
³ Institut für Kernphysik, J W Goethe-Universität Frankfurt am Main, Max-von-Laue-Str. 1, D-60438 Frankfurt, Germany
⁴ Department of Physics, Kansas State University, Manhattan, KS 66506, USA
⁵ Physics Department, American University of Sharjah, Sharjah, UAE
⁶ Department of Physics, Auburn University, AL 36849, USA
E-mail: TYOsipov@lbl.gov

Abstract. Coincident measurement of the Auger electron and fragment ion momenta emitted after carbon core-level photoionization of acetylene has yielded new understanding of how the dication fragments. Ab initio calculations and experimental data, including body-frame Auger angular distributions, are used to identify the parent electronic states and together yield a comprehensive map of the dissociation pathways which include surface crossings and barriers to direct dissociation. The Auger angular distributions for certain breakup channels show evidence of core–hole localization.

Print publication: Issue 9 (14 May 2008)
Received 24 March 2008, in final form 25 March 2008
Published 23 April 2008

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Fragmentation pathways for selected electronic states of the acetylene dication

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